Rotational moulding and mechanical characterisation of halloysite reinforced polyethylenes

Höfler, Günther; Lin, Richard; Jayaraman, Krishnan

doi:10.1007/s10965-018-1525-3

Cited by 20 publications

(14 citation statements)

References 23 publications

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“…Finally, the addition of nano-fillers, such as halloysite, has been shown to have a similar effect on the mechanical properties of LLDPE, as reported in [25], where an increase of the modulus from 700 to 850 MPa was brought by a toughness decrease from 200 to 50 J/m.…”

Section: Resultssupporting

confidence: 58%

Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

et al. 2019

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This work is aimed at studying the suitability of ultra-high molecular weight polyethylene (UHMWPE) fibers for the production of polyethylene homo-composites processed by rotational molding. Initially pre-impregnated bars were produced by co-extrusion and compression molding of UHMWPE fibers and linear low-density polyethylene (LLDPE). A preliminary screening of different processing routes for the production of homo-composite reinforcing bars was performed, highlighting the relevance of fiber impregnation and crystalline structure on the mechanical properties. A combination of co-extrusion and compression molding was found to optimize the mechanical properties of the reinforcing bars, which were incorporated in the LLDPE matrix during a standard rotational molding process. Apart from fiber placement and an increase in processing time, processing of homo-composites did not require any modification of the existing production procedures. Plate bending tests performed on rotational molded homo-composites showed a modulus increase to a value three times higher than that of neat LLDPE. This increase was obtained by the addition of 4% of UHWMPE fibers and a negligible increase of the weight of the component. Dart impact tests also showed an increased toughness compared to neat LLPDE.

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Section: Resultssupporting

confidence: 58%

Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

et al. 2019

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“…Following the work of Höfler et al [31], the use of melt blending of composite ingredients was omitted. They found that in the case of the use of linear medium density polyethylene, the difference between preliminary dry blended materials and compounded was negligible.…”

Section: Rotational Molding Of Polymer Compositesmentioning

confidence: 99%

Rotational Molding of Linear Low-Density Polyethylene Composites Filled with Wheat Bran

et al. 2020

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Application of lignocellulosic fillers in the manufacturing of wood polymer composites (WPCs) is a very popular trend of research, however it is still rarely observed in the case of rotational molding. The present study aimed to analyze the impact of wheat bran content (from 2.5 wt.% to 20 wt.%) on the performance of rotationally-molded composites based on a linear low-density polyethylene (LLDPE) matrix. Microscopic structure (scanning electron microscopy), as well as physico-mechanical (density, porosity, tensile performance, hardness, rebound resilience, dynamic mechanical analysis), rheological (oscillatory rheometry) and thermo-mechanical (Vicat softening temperature) properties of composites were investigated. Incorporation of 2.5 wt.% and 5 wt.% of wheat bran did not cause significant deterioration of the mechanical performance of the material, despite the presence of ‘pin-holes’ at the surface. Values of tensile strength and rebound resilience were maintained at a very similar level, while hardness was slightly decreased, which was associated with the porosity of the structure. Higher loadings resulted in the deterioration of mechanical performance, which was also expressed by the noticeable rise of the adhesion factor. For lower loadings of filler did not affect the rheological properties. However, composites with 10wt.% and 20 wt.% also showed behavior suitable for rotational molding. The presented results indicate that the manufacturing of thin-walled products based on wood polymer composites via rotational molding should be considered a very interesting direction of research.

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Section: Introductionmentioning

confidence: 99%

“…The use of rotomolding for thermosetting materials was also observed, such as epoxy resins, 39 polyurethane, 40 phenolic resins, 41 and unsaturated polyester. 1,42 Inorganic fillers used in rotomolded material include wollastonite 43 and halloysite clay, 44 calcium carbonate, 45 graphite, 30,46,47 silica, [48][49][50][51] carbon nanotubes, 52 glass fibers, [52][53][54][55] and carbon. 52 The organic lignocellulosic fillers studied were cabuya (Andean sisal, Furcraea cabuya) 11 and sisal (Agave sisalana); 11,15 wood fiber; 12 flax; 15 oil palm empty fruit bunch; 56 agave (sisal species native to Central America, Agave tequilana); 13,14,57,58 pine wood; 59 coir, 59 maple wood; 60 banana and abaca´; 61 maple; 3,62 and hemp.…”

Section: Introductionmentioning

confidence: 99%

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

León

Escócio

Visconte

et al. 2020

Journal of Reinforced Plastics and Composites

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Rotomolding is a versatile process used in the manufacture of thermoplastic polymeric materials to produce large hollow plastic parts. The aim of this review article was to discuss the rotomolding process and show the properties of the polyethylene composite and rotomolded lignocellulosic fibers, which are processed for prolonged periods under temperature. The main process parameters studied are the shaft speed of the equipment, molding temperature, polymer particle size, polymer melt flow index, and amount of material, which must be well controlled to achieve a non-degraded product with homogeneous thickness and no porosity. Rotomolded composites containing sisal, pine, coir, banana, flax, and maple wood fibers, among others, have been evaluated primarily for their mechanical (impact, flexural, and tensile strength) and morphological properties. The type, content, and treatment of lignocellulosic fillers are the most widely studied variables in polyethylene-based rotomolded composites. Fiber content was the variable that most influenced mechanical properties, particularly impact strength and hardness due to the voids formed by the hydrodynamic volume between the polymer matrix and lignocellulosic filler. Chemical treatment of the fiber by mercerization with NaOH made it more hydrophobic and the addition of maleic anhydride-grafted polyethylene as a coupling agent improved the interfacial adhesion between the non-polar polymer matrix and polar filler. However, the best mechanical property results were obtained with the use of maleic anhydride-grafted polyethylene.

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Rotational moulding and mechanical characterisation of halloysite reinforced polyethylenes

Cited by 20 publications

References 23 publications

Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

Rotational Molding of Linear Low-Density Polyethylene Composites Filled with Wheat Bran

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

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